Substring Modifier for Gravity Forms Merge Tags

Tutorials » GravityWP BV » Substring Modifier for Gravity Forms Merge Tags

Do you want to return a portion of a Merge Tag string output? And specify an offset and length of the part of the Merge Tag output? With Advanced Merge Tags it’s as easy as it gets.

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Using the gwp_substring Modifier for Gravity Forms

With the gwp_substring Modifier for Gravity Forms Merge Tags it’s possible to return a part of value (a substring of the original string). You can use the modifier like this:

:gwp_substring start= length=

The modifier has two arguments:

start: how many characters should it skip when using a positive value / where does the substring start. When using a negative value (for example -3), the substring will start the number of characters before the end of the value.
length: how many characters should be in the substring / what is the length of the substring.

Try it yourself

Example gwp_substring

This example gives back a substring of the value in the Gravity Forms field ‘String’ (with Field ID 1). It skips the first two characters and gives back 3 characters:

{String:1:gwp_substring start=2 length=3}

Offset from the end of the string

When using a negative value for the start of the substring (for example start=-3), the substring will start 3 characters before the end of the value (string).

{String:1:gwp_substring start=-3 length=1}

Examples offset and length

s	u	b	s	t	r	i	n	g
1	2	3	4	5	6	7	8	9

Merge Tag & Modifier	Output
`{String:1}`	substring
`{String:1:gwp_substring length=3}`	sub
`{String:1:gwp_substring start=3 length=3}`	str
`{String:1:gwp_substring start=-3}`	ing
`{String:1:gwp_substring start=-3 length=1}`	i

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